With the rapid development of intelligent electronic and military equipment

multifunctional flexible materials integrating electromagnetic interference (EMI) shielding

temperature sensing

and information encryption are urgently needed. This study presents a bio-inspired hierarchical composite foam fabricated using supercritical nitrogen foaming technology. This material exhibits a honeycomb structure

with pore cell sizes controllable within a range of 30 to 92 µm by regulating the filler. The carbon fiber felt (CFf) provides efficient reflection of electromagnetic waves

while the chloroprene rubber/carbon fiber /carbon black (CR/CF/CB) foam facilitates both wave absorption and temperature monitoring through its optimized conductive network. This synergistic mechanism results in an EMI shielding effectiveness (SE) of 60.06 dB with excellent temperature sensing performance (TCR = -2.642%/°C) in the 24-70 °C range. Notably

the material has a thermal conductivity of up to 0.159 W/m·K

and the bio-inspired layered design enables information encryption

demonstrating the material's potential for secure communication applications. The foam also has tensile properties of up to 5.13 MPa and a tear strength of 33.02 N/mm. This biomimetic design overcomes the traditional limitations of flexible materials and provides a transformative solution for next-generation applications such as flexible electronics

aerospace systems and military equipment that urgently need integrated electromagnetic protection

thermal management and information security.